DES16C3cje: A low-luminosity, long-lived supernova

Guti´errez, C P and Sullivan, M and Desai, Shantanu and et al, . (2020) DES16C3cje: A low-luminosity, long-lived supernova.


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We present DES16C3cje, a low-luminosity, long-lived type II supernova (SN II) at redshift 0.0618, detected by the Dark Energy Survey (DES). DES16C3cje is a unique SN. The spectra are characterized by extremely narrow photospheric lines corresponding to very low expansion velocities of . 1500 km s−1 , and the light curve shows an initial peak that fades after 50 days before slowly rebrightening over a further 100 days to reach an absolute brightness of Mr ∼ −15.5 mag. The decline rate of the late-time light curve is then slower than that expected from the powering by radioactive decay of 56Co, but is comparable to that expected from accretion power. Comparing the bolometric light curve with hydrodynamical models, we find that DES16C3cje can be explained by either i) a low explosion energy (0.11 foe) and relatively large 56Ni production of 0.075 M� from a ∼ 15 M� red supergiant progenitor typical of other SNe II, or ii) a relatively compact ∼ 40 M� star, explosion energy of 1 foe, and 0.08 M� of 56Ni. Both scenarios require additional energy input to explain the late-time light curve, which is consistent with fallback accretion at a rate of ∼ 0.5 × 10−8 M� s −1 .

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IITH Creators:
IITH CreatorsORCiD
Desai, Shantanu
Item Type: Article
Subjects: Physics
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 07 Feb 2020 04:17
Last Modified: 07 Feb 2020 04:17
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